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    				| 1. | यदि x + y = 10 व xy = 21, तब x3 + y3 का मान ज्ञात कीजिए। | 
| Answer» x + y = 10 ……………. (1) घन करने पर (x + y)3 = (10)3 x3 + y3 + 3xy (x + y) = 1000 x3 + y3 + 3. 21 (10) = 1000 x3 + y3 + 630 = 1000 x3 + y 3 = 1000 – 630 = 370 | |